HT instruments HT78 - Manual (Page 2)

HT78
EN - 1
Table of contents:
1. SAFETY PRECAUTIONS AND PROCEDURES ..........................................................2
1.1. Preliminary ........................................................................................................................ 2
1.2. Before use......................................................................................................................... 3
1.3. After use............................................................................................................................ 3
1.4. Measuring (overvoltage) categories definitions................................................................. 3
2. GENERAL DESCRIPTION ...........................................................................................4
2.1. TRMS and MEAN VALUE measuring instruments............................................................ 4
2.2. TRUE ROOT MEAN SQUARE VALUE and CREST FACTOR definitions........................ 4
3. PREPARATION FOR USE ...........................................................................................5
3.1. Initial.................................................................................................................................. 5
3.2. Power supply..................................................................................................................... 5
3.3. Calibration ......................................................................................................................... 5
3.4. Storage.............................................................................................................................. 5
4. OPERATING INSTRUCTIONS.....................................................................................6
4.1. Instrument description....................................................................................................... 6
4.1.1. Front panel.................................................................................................................................. 6
4.2. Description of parts ........................................................................................................... 7
4.2.1. Range and ON/OFF selector...................................................................................................... 7
4.2.2. D-H key....................................................................................................................................... 7
4.2.3. FILTER selector.......................................................................................................................... 7
4.2.4. LOCK selector ............................................................................................................................ 7
4.2.5. AutoPowerOFF........................................................................................................................... 7
4.2.6. DC analogical output .................................................................................................................. 8
4.3. How to perform the measurements ................................................................................... 9
4.3.1. AC Current measurement........................................................................................................... 9
4.3.2. Leakage current measurement on Single phase system ......................................................... 10
4.3.3. Leakage current measurement on Three phase system.......................................................... 11
5. MAINTENANCE .........................................................................................................12
5.1. General informations ....................................................................................................... 12
5.2. Batteries replacement ..................................................................................................... 12
5.3. Cleaning .......................................................................................................................... 12
5.4. End of life ........................................................................................................................ 12
6. TECHNICAL SPECIFICATIONS ................................................................................13
6.1. Characteristics................................................................................................................. 13
6.1.1. Safety........................................................................................................................................ 13
6.1.2. General data............................................................................................................................. 13
6.2. Environmental conditions ................................................................................................ 14
6.2.1. Climatic conditions.................................................................................................................... 14
6.3. Accessories ..................................................................................................................... 14
6.3.1. Standard accessories ............................................................................................................... 14
7. SERVICE....................................................................................................................15
7.1. Warranty conditions......................................................................................................... 15
7.2. Service ............................................................................................................................ 15